TOO TIGHT TENSIONER TORQUE
We have found that failures on 4.0l Ford SOHC secondary timing tensioners may be due to over torquing the tensioner at the time of installation and failure to replace the volume reduction plug. We compared the revised instructions included with the OEM Ford tensioner (32 lb-ft) and the instructions given by other industry sources (49 lb-ft). From now on we will include the installation instructions from Ford with our parts.

DNJ Engine Components
Chatsworth, CA
June, 2014